package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 条件删除分类 判断分类中是否关联套餐或者菜品
     *
     * @param id
     */
    @Override

    public void remove(Long id) {
        //首先添加查询条件对象
        LambdaQueryWrapper<Dish> lqw = new LambdaQueryWrapper<>();
        //设置条件
        lqw.eq(Dish::getCategoryId, id);
        //开始查询 返回通过id查到关联到的餐品数量
        int count = dishService.count(lqw);
        //判断
        if (count>0){
          throw new CustomException("当前分类下关联了菜品，不能删除");//已经关联菜品，抛出一个业务异常
        }

        //套餐关联和菜品关联同理
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        if(count2 > 0){
            throw new CustomException("当前分类下关联了套餐，不能删除");//已经关联套餐，抛出一个业务异常
        }

        //最后如果都没有关联 那就正常删除
        super.removeById(id);

    }
}
